1 /*
2 * LCD / Backlight control code for Sharp SL-6000x (tosa)
3 *
4 * Copyright (c) 2005 Dirk Opfer
5 * Copyright (c) 2007,2008 Dmitry Baryshkov
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 */
12
13 #include <linux/kernel.h>
14 #include <linux/module.h>
15 #include <linux/device.h>
16 #include <linux/spi/spi.h>
17 #include <linux/i2c.h>
18 #include <linux/slab.h>
19 #include <linux/gpio.h>
20 #include <linux/delay.h>
21 #include <linux/lcd.h>
22 #include <linux/fb.h>
23
24 #include <asm/mach/sharpsl_param.h>
25
26 #include <mach/tosa.h>
27
28 #define POWER_IS_ON(pwr) ((pwr) <= FB_BLANK_NORMAL)
29
30 #define TG_REG0_VQV 0x0001
31 #define TG_REG0_COLOR 0x0002
32 #define TG_REG0_UD 0x0004
33 #define TG_REG0_LR 0x0008
34
35 #define DAC_BASE 0x4e
36
37 struct tosa_lcd_data {
38 struct spi_device *spi;
39 struct lcd_device *lcd;
40 struct i2c_client *i2c;
41
42 int lcd_power;
43 bool is_vga;
44 };
45
tosa_tg_send(struct spi_device * spi,int adrs,uint8_t data)46 static int tosa_tg_send(struct spi_device *spi, int adrs, uint8_t data)
47 {
48 u8 buf[1];
49 struct spi_message msg;
50 struct spi_transfer xfer = {
51 .len = 1,
52 .cs_change = 1,
53 .tx_buf = buf,
54 };
55
56 buf[0] = ((adrs & 0x07) << 5) | (data & 0x1f);
57 spi_message_init(&msg);
58 spi_message_add_tail(&xfer, &msg);
59
60 return spi_sync(spi, &msg);
61 }
62
tosa_bl_enable(struct spi_device * spi,int enable)63 int tosa_bl_enable(struct spi_device *spi, int enable)
64 {
65 /* bl_enable GP04=1 otherwise GP04=0*/
66 return tosa_tg_send(spi, TG_GPODR2, enable? 0x01 : 0x00);
67 }
68 EXPORT_SYMBOL(tosa_bl_enable);
69
tosa_lcd_tg_init(struct tosa_lcd_data * data)70 static void tosa_lcd_tg_init(struct tosa_lcd_data *data)
71 {
72 /* TG on */
73 gpio_set_value(TOSA_GPIO_TG_ON, 0);
74
75 mdelay(60);
76
77 /* delayed 0clk TCTL signal for VGA */
78 tosa_tg_send(data->spi, TG_TPOSCTL, 0x00);
79 /* GPOS0=powercontrol, GPOS1=GPIO, GPOS2=TCTL */
80 tosa_tg_send(data->spi, TG_GPOSR, 0x02);
81 }
82
tosa_lcd_tg_on(struct tosa_lcd_data * data)83 static void tosa_lcd_tg_on(struct tosa_lcd_data *data)
84 {
85 struct spi_device *spi = data->spi;
86 int value = TG_REG0_COLOR | TG_REG0_UD | TG_REG0_LR;
87
88 if (data->is_vga)
89 value |= TG_REG0_VQV;
90
91 tosa_tg_send(spi, TG_PNLCTL, value);
92
93 /* TG LCD pannel power up */
94 tosa_tg_send(spi, TG_PINICTL,0x4);
95 mdelay(50);
96
97 /* TG LCD GVSS */
98 tosa_tg_send(spi, TG_PINICTL,0x0);
99
100 if (!data->i2c) {
101 /* after the pannel is powered up the first time, we can access the i2c bus */
102 /* so probe for the DAC */
103 struct i2c_adapter *adap = i2c_get_adapter(0);
104 struct i2c_board_info info = {
105 .type = "tosa-bl",
106 .addr = DAC_BASE,
107 .platform_data = data->spi,
108 };
109 data->i2c = i2c_new_device(adap, &info);
110 }
111 }
112
tosa_lcd_tg_off(struct tosa_lcd_data * data)113 static void tosa_lcd_tg_off(struct tosa_lcd_data *data)
114 {
115 struct spi_device *spi = data->spi;
116
117 /* TG LCD VHSA off */
118 tosa_tg_send(spi, TG_PINICTL,0x4);
119 mdelay(50);
120
121 /* TG LCD signal off */
122 tosa_tg_send(spi, TG_PINICTL,0x6);
123 mdelay(50);
124
125 /* TG Off */
126 gpio_set_value(TOSA_GPIO_TG_ON, 1);
127 mdelay(100);
128 }
129
tosa_lcd_set_power(struct lcd_device * lcd,int power)130 int tosa_lcd_set_power(struct lcd_device *lcd, int power)
131 {
132 struct tosa_lcd_data *data = lcd_get_data(lcd);
133
134 if (POWER_IS_ON(power) && !POWER_IS_ON(data->lcd_power))
135 tosa_lcd_tg_on(data);
136
137 if (!POWER_IS_ON(power) && POWER_IS_ON(data->lcd_power))
138 tosa_lcd_tg_off(data);
139
140 data->lcd_power = power;
141 return 0;
142 }
143
tosa_lcd_get_power(struct lcd_device * lcd)144 static int tosa_lcd_get_power(struct lcd_device *lcd)
145 {
146 struct tosa_lcd_data *data = lcd_get_data(lcd);
147
148 return data->lcd_power;
149 }
150
tosa_lcd_set_mode(struct lcd_device * lcd,struct fb_videomode * mode)151 static int tosa_lcd_set_mode(struct lcd_device *lcd, struct fb_videomode *mode)
152 {
153 struct tosa_lcd_data *data = lcd_get_data(lcd);
154
155 if (mode->xres == 320 || mode->yres == 320)
156 data->is_vga = false;
157 else
158 data->is_vga = true;
159
160 if (POWER_IS_ON(data->lcd_power))
161 tosa_lcd_tg_on(data);
162
163 return 0;
164 }
165
166 static struct lcd_ops tosa_lcd_ops = {
167 .set_power = tosa_lcd_set_power,
168 .get_power = tosa_lcd_get_power,
169 .set_mode = tosa_lcd_set_mode,
170 };
171
tosa_lcd_probe(struct spi_device * spi)172 static int __devinit tosa_lcd_probe(struct spi_device *spi)
173 {
174 int ret;
175 struct tosa_lcd_data *data;
176
177 data = kzalloc(sizeof(struct tosa_lcd_data), GFP_KERNEL);
178 if (!data)
179 return -ENOMEM;
180
181 data->is_vga = true; /* default to VGA mode */
182
183 /*
184 * bits_per_word cannot be configured in platform data
185 */
186 spi->bits_per_word = 8;
187
188 ret = spi_setup(spi);
189 if (ret < 0)
190 goto err_spi;
191
192 data->spi = spi;
193 dev_set_drvdata(&spi->dev, data);
194
195 ret = gpio_request(TOSA_GPIO_TG_ON, "tg #pwr");
196 if (ret < 0)
197 goto err_gpio_tg;
198
199 mdelay(60);
200
201 ret = gpio_direction_output(TOSA_GPIO_TG_ON, 0);
202 if (ret < 0)
203 goto err_gpio_dir;
204
205 mdelay(60);
206 tosa_lcd_tg_init(data);
207
208 tosa_lcd_tg_on(data);
209
210 data->lcd = lcd_device_register("tosa-lcd", &spi->dev, data,
211 &tosa_lcd_ops);
212
213 if (IS_ERR(data->lcd)) {
214 ret = PTR_ERR(data->lcd);
215 data->lcd = NULL;
216 goto err_register;
217 }
218
219 return 0;
220
221 err_register:
222 tosa_lcd_tg_off(data);
223 err_gpio_dir:
224 gpio_free(TOSA_GPIO_TG_ON);
225 err_gpio_tg:
226 dev_set_drvdata(&spi->dev, NULL);
227 err_spi:
228 kfree(data);
229 return ret;
230 }
231
tosa_lcd_remove(struct spi_device * spi)232 static int __devexit tosa_lcd_remove(struct spi_device *spi)
233 {
234 struct tosa_lcd_data *data = dev_get_drvdata(&spi->dev);
235
236 lcd_device_unregister(data->lcd);
237
238 if (data->i2c)
239 i2c_unregister_device(data->i2c);
240
241 tosa_lcd_tg_off(data);
242
243 gpio_free(TOSA_GPIO_TG_ON);
244 dev_set_drvdata(&spi->dev, NULL);
245 kfree(data);
246
247 return 0;
248 }
249
250 #ifdef CONFIG_PM
tosa_lcd_suspend(struct spi_device * spi,pm_message_t state)251 static int tosa_lcd_suspend(struct spi_device *spi, pm_message_t state)
252 {
253 struct tosa_lcd_data *data = dev_get_drvdata(&spi->dev);
254
255 tosa_lcd_tg_off(data);
256
257 return 0;
258 }
259
tosa_lcd_resume(struct spi_device * spi)260 static int tosa_lcd_resume(struct spi_device *spi)
261 {
262 struct tosa_lcd_data *data = dev_get_drvdata(&spi->dev);
263
264 tosa_lcd_tg_init(data);
265 if (POWER_IS_ON(data->lcd_power))
266 tosa_lcd_tg_on(data);
267 else
268 tosa_lcd_tg_off(data);
269
270 return 0;
271 }
272 #else
273 #define tosa_lcd_suspend NULL
274 #define tosa_lcd_reume NULL
275 #endif
276
277 static struct spi_driver tosa_lcd_driver = {
278 .driver = {
279 .name = "tosa-lcd",
280 .owner = THIS_MODULE,
281 },
282 .probe = tosa_lcd_probe,
283 .remove = __devexit_p(tosa_lcd_remove),
284 .suspend = tosa_lcd_suspend,
285 .resume = tosa_lcd_resume,
286 };
287
tosa_lcd_init(void)288 static int __init tosa_lcd_init(void)
289 {
290 return spi_register_driver(&tosa_lcd_driver);
291 }
292
tosa_lcd_exit(void)293 static void __exit tosa_lcd_exit(void)
294 {
295 spi_unregister_driver(&tosa_lcd_driver);
296 }
297
298 module_init(tosa_lcd_init);
299 module_exit(tosa_lcd_exit);
300
301 MODULE_AUTHOR("Dmitry Baryshkov");
302 MODULE_LICENSE("GPL v2");
303 MODULE_DESCRIPTION("LCD/Backlight control for Sharp SL-6000 PDA");
304 MODULE_ALIAS("spi:tosa-lcd");
305