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e7fb9c4a AP |
1 | /* |
2 | * l4f00242t03.c -- support for Epson L4F00242T03 LCD | |
3 | * | |
4 | * Copyright 2007-2009 Freescale Semiconductor, Inc. All Rights Reserved. | |
5 | * | |
6 | * Copyright (c) 2009 Alberto Panizzo <maramaopercheseimorto@gmail.com> | |
e4f8ae70 | 7 | * Inspired by Marek Vasut work in l4f00242t03.c |
e7fb9c4a AP |
8 | * |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License version 2 as | |
11 | * published by the Free Software Foundation. | |
12 | */ | |
13 | ||
6677110b JH |
14 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
15 | ||
e7fb9c4a AP |
16 | #include <linux/device.h> |
17 | #include <linux/kernel.h> | |
18 | #include <linux/delay.h> | |
355b200b | 19 | #include <linux/module.h> |
e7fb9c4a AP |
20 | #include <linux/gpio.h> |
21 | #include <linux/lcd.h> | |
5a0e3ad6 | 22 | #include <linux/slab.h> |
e7fb9c4a AP |
23 | #include <linux/regulator/consumer.h> |
24 | ||
25 | #include <linux/spi/spi.h> | |
26 | #include <linux/spi/l4f00242t03.h> | |
27 | ||
28 | struct l4f00242t03_priv { | |
29 | struct spi_device *spi; | |
30 | struct lcd_device *ld; | |
95558ad1 | 31 | int lcd_state; |
e7fb9c4a AP |
32 | struct regulator *io_reg; |
33 | struct regulator *core_reg; | |
34 | }; | |
35 | ||
e7fb9c4a AP |
36 | static void l4f00242t03_reset(unsigned int gpio) |
37 | { | |
38 | pr_debug("l4f00242t03_reset.\n"); | |
39 | gpio_set_value(gpio, 1); | |
40 | mdelay(100); | |
41 | gpio_set_value(gpio, 0); | |
42 | mdelay(10); /* tRES >= 100us */ | |
43 | gpio_set_value(gpio, 1); | |
44 | mdelay(20); | |
45 | } | |
46 | ||
47 | #define param(x) ((x) | 0x100) | |
48 | ||
49 | static void l4f00242t03_lcd_init(struct spi_device *spi) | |
50 | { | |
51 | struct l4f00242t03_pdata *pdata = spi->dev.platform_data; | |
60066078 | 52 | struct l4f00242t03_priv *priv = spi_get_drvdata(spi); |
e7fb9c4a | 53 | const u16 cmd[] = { 0x36, param(0), 0x3A, param(0x60) }; |
ef73e632 | 54 | int ret; |
e7fb9c4a AP |
55 | |
56 | dev_dbg(&spi->dev, "initializing LCD\n"); | |
57 | ||
ef73e632 JH |
58 | ret = regulator_set_voltage(priv->io_reg, 1800000, 1800000); |
59 | if (ret) { | |
60 | dev_err(&spi->dev, "failed to set the IO regulator voltage.\n"); | |
61 | return; | |
62 | } | |
63 | ret = regulator_enable(priv->io_reg); | |
64 | if (ret) { | |
65 | dev_err(&spi->dev, "failed to enable the IO regulator.\n"); | |
66 | return; | |
67 | } | |
68 | ||
69 | ret = regulator_set_voltage(priv->core_reg, 2800000, 2800000); | |
70 | if (ret) { | |
71 | dev_err(&spi->dev, "failed to set the core regulator voltage.\n"); | |
72 | regulator_disable(priv->io_reg); | |
73 | return; | |
74 | } | |
75 | ret = regulator_enable(priv->core_reg); | |
76 | if (ret) { | |
77 | dev_err(&spi->dev, "failed to enable the core regulator.\n"); | |
78 | regulator_disable(priv->io_reg); | |
79 | return; | |
80 | } | |
e7fb9c4a | 81 | |
aff5ce6c AP |
82 | l4f00242t03_reset(pdata->reset_gpio); |
83 | ||
e7fb9c4a AP |
84 | gpio_set_value(pdata->data_enable_gpio, 1); |
85 | msleep(60); | |
86 | spi_write(spi, (const u8 *)cmd, ARRAY_SIZE(cmd) * sizeof(u16)); | |
87 | } | |
88 | ||
95558ad1 AP |
89 | static void l4f00242t03_lcd_powerdown(struct spi_device *spi) |
90 | { | |
91 | struct l4f00242t03_pdata *pdata = spi->dev.platform_data; | |
60066078 | 92 | struct l4f00242t03_priv *priv = spi_get_drvdata(spi); |
95558ad1 AP |
93 | |
94 | dev_dbg(&spi->dev, "Powering down LCD\n"); | |
95 | ||
96 | gpio_set_value(pdata->data_enable_gpio, 0); | |
97 | ||
0556dc34 MB |
98 | regulator_disable(priv->io_reg); |
99 | regulator_disable(priv->core_reg); | |
95558ad1 AP |
100 | } |
101 | ||
102 | static int l4f00242t03_lcd_power_get(struct lcd_device *ld) | |
103 | { | |
104 | struct l4f00242t03_priv *priv = lcd_get_data(ld); | |
105 | ||
106 | return priv->lcd_state; | |
107 | } | |
108 | ||
e7fb9c4a AP |
109 | static int l4f00242t03_lcd_power_set(struct lcd_device *ld, int power) |
110 | { | |
111 | struct l4f00242t03_priv *priv = lcd_get_data(ld); | |
112 | struct spi_device *spi = priv->spi; | |
113 | ||
114 | const u16 slpout = 0x11; | |
115 | const u16 dison = 0x29; | |
116 | ||
117 | const u16 slpin = 0x10; | |
118 | const u16 disoff = 0x28; | |
119 | ||
4dbdf886 | 120 | if (power <= FB_BLANK_NORMAL) { |
95558ad1 AP |
121 | if (priv->lcd_state <= FB_BLANK_NORMAL) { |
122 | /* Do nothing, the LCD is running */ | |
123 | } else if (priv->lcd_state < FB_BLANK_POWERDOWN) { | |
124 | dev_dbg(&spi->dev, "Resuming LCD\n"); | |
125 | ||
126 | spi_write(spi, (const u8 *)&slpout, sizeof(u16)); | |
127 | msleep(60); | |
128 | spi_write(spi, (const u8 *)&dison, sizeof(u16)); | |
129 | } else { | |
130 | /* priv->lcd_state == FB_BLANK_POWERDOWN */ | |
131 | l4f00242t03_lcd_init(spi); | |
132 | priv->lcd_state = FB_BLANK_VSYNC_SUSPEND; | |
133 | l4f00242t03_lcd_power_set(priv->ld, power); | |
134 | } | |
135 | } else if (power < FB_BLANK_POWERDOWN) { | |
136 | if (priv->lcd_state <= FB_BLANK_NORMAL) { | |
137 | /* Send the display in standby */ | |
138 | dev_dbg(&spi->dev, "Standby the LCD\n"); | |
139 | ||
140 | spi_write(spi, (const u8 *)&disoff, sizeof(u16)); | |
141 | msleep(60); | |
142 | spi_write(spi, (const u8 *)&slpin, sizeof(u16)); | |
143 | } else if (priv->lcd_state < FB_BLANK_POWERDOWN) { | |
144 | /* Do nothing, the LCD is already in standby */ | |
145 | } else { | |
146 | /* priv->lcd_state == FB_BLANK_POWERDOWN */ | |
147 | l4f00242t03_lcd_init(spi); | |
148 | priv->lcd_state = FB_BLANK_UNBLANK; | |
149 | l4f00242t03_lcd_power_set(ld, power); | |
150 | } | |
e7fb9c4a | 151 | } else { |
95558ad1 | 152 | /* power == FB_BLANK_POWERDOWN */ |
26bbabc8 AP |
153 | if (priv->lcd_state != FB_BLANK_POWERDOWN) { |
154 | /* Clear the screen before shutting down */ | |
155 | spi_write(spi, (const u8 *)&disoff, sizeof(u16)); | |
156 | msleep(60); | |
157 | l4f00242t03_lcd_powerdown(spi); | |
158 | } | |
e7fb9c4a AP |
159 | } |
160 | ||
95558ad1 AP |
161 | priv->lcd_state = power; |
162 | ||
e7fb9c4a AP |
163 | return 0; |
164 | } | |
165 | ||
166 | static struct lcd_ops l4f_ops = { | |
167 | .set_power = l4f00242t03_lcd_power_set, | |
95558ad1 | 168 | .get_power = l4f00242t03_lcd_power_get, |
e7fb9c4a AP |
169 | }; |
170 | ||
1b9e450d | 171 | static int l4f00242t03_probe(struct spi_device *spi) |
e7fb9c4a AP |
172 | { |
173 | struct l4f00242t03_priv *priv; | |
174 | struct l4f00242t03_pdata *pdata = spi->dev.platform_data; | |
175 | int ret; | |
176 | ||
177 | if (pdata == NULL) { | |
178 | dev_err(&spi->dev, "Uninitialized platform data.\n"); | |
179 | return -EINVAL; | |
180 | } | |
181 | ||
ba4a887a JH |
182 | priv = devm_kzalloc(&spi->dev, sizeof(struct l4f00242t03_priv), |
183 | GFP_KERNEL); | |
e7fb9c4a AP |
184 | |
185 | if (priv == NULL) { | |
186 | dev_err(&spi->dev, "No memory for this device.\n"); | |
beb0a43f | 187 | return -ENOMEM; |
e7fb9c4a AP |
188 | } |
189 | ||
60066078 | 190 | spi_set_drvdata(spi, priv); |
e7fb9c4a AP |
191 | spi->bits_per_word = 9; |
192 | spi_setup(spi); | |
193 | ||
194 | priv->spi = spi; | |
195 | ||
62a5c075 JH |
196 | ret = devm_gpio_request_one(&spi->dev, pdata->reset_gpio, |
197 | GPIOF_OUT_INIT_HIGH, "lcd l4f00242t03 reset"); | |
e7fb9c4a AP |
198 | if (ret) { |
199 | dev_err(&spi->dev, | |
200 | "Unable to get the lcd l4f00242t03 reset gpio.\n"); | |
ba4a887a | 201 | return ret; |
e7fb9c4a AP |
202 | } |
203 | ||
62a5c075 JH |
204 | ret = devm_gpio_request_one(&spi->dev, pdata->data_enable_gpio, |
205 | GPIOF_OUT_INIT_LOW, "lcd l4f00242t03 data enable"); | |
e7fb9c4a AP |
206 | if (ret) { |
207 | dev_err(&spi->dev, | |
208 | "Unable to get the lcd l4f00242t03 data en gpio.\n"); | |
62a5c075 | 209 | return ret; |
e7fb9c4a AP |
210 | } |
211 | ||
610b71a6 | 212 | priv->io_reg = devm_regulator_get(&spi->dev, "vdd"); |
0556dc34 MB |
213 | if (IS_ERR(priv->io_reg)) { |
214 | dev_err(&spi->dev, "%s: Unable to get the IO regulator\n", | |
215 | __func__); | |
62a5c075 | 216 | return PTR_ERR(priv->io_reg); |
e7fb9c4a AP |
217 | } |
218 | ||
610b71a6 | 219 | priv->core_reg = devm_regulator_get(&spi->dev, "vcore"); |
0556dc34 MB |
220 | if (IS_ERR(priv->core_reg)) { |
221 | dev_err(&spi->dev, "%s: Unable to get the core regulator\n", | |
222 | __func__); | |
610b71a6 | 223 | return PTR_ERR(priv->core_reg); |
e7fb9c4a AP |
224 | } |
225 | ||
226 | priv->ld = lcd_device_register("l4f00242t03", | |
227 | &spi->dev, priv, &l4f_ops); | |
610b71a6 AL |
228 | if (IS_ERR(priv->ld)) |
229 | return PTR_ERR(priv->ld); | |
e7fb9c4a AP |
230 | |
231 | /* Init the LCD */ | |
e7fb9c4a | 232 | l4f00242t03_lcd_init(spi); |
95558ad1 AP |
233 | priv->lcd_state = FB_BLANK_VSYNC_SUSPEND; |
234 | l4f00242t03_lcd_power_set(priv->ld, FB_BLANK_UNBLANK); | |
e7fb9c4a AP |
235 | |
236 | dev_info(&spi->dev, "Epson l4f00242t03 lcd probed.\n"); | |
237 | ||
238 | return 0; | |
e7fb9c4a AP |
239 | } |
240 | ||
7e4b9d0b | 241 | static int l4f00242t03_remove(struct spi_device *spi) |
e7fb9c4a | 242 | { |
60066078 | 243 | struct l4f00242t03_priv *priv = spi_get_drvdata(spi); |
e7fb9c4a | 244 | |
95558ad1 | 245 | l4f00242t03_lcd_power_set(priv->ld, FB_BLANK_POWERDOWN); |
e7fb9c4a | 246 | lcd_device_unregister(priv->ld); |
60066078 | 247 | spi_set_drvdata(spi, NULL); |
95558ad1 | 248 | |
e7fb9c4a AP |
249 | return 0; |
250 | } | |
251 | ||
95558ad1 AP |
252 | static void l4f00242t03_shutdown(struct spi_device *spi) |
253 | { | |
60066078 | 254 | struct l4f00242t03_priv *priv = spi_get_drvdata(spi); |
95558ad1 AP |
255 | |
256 | if (priv) | |
257 | l4f00242t03_lcd_power_set(priv->ld, FB_BLANK_POWERDOWN); | |
258 | ||
259 | } | |
260 | ||
e7fb9c4a AP |
261 | static struct spi_driver l4f00242t03_driver = { |
262 | .driver = { | |
263 | .name = "l4f00242t03", | |
264 | .owner = THIS_MODULE, | |
265 | }, | |
266 | .probe = l4f00242t03_probe, | |
d1723fa2 | 267 | .remove = l4f00242t03_remove, |
95558ad1 | 268 | .shutdown = l4f00242t03_shutdown, |
e7fb9c4a AP |
269 | }; |
270 | ||
462dd838 | 271 | module_spi_driver(l4f00242t03_driver); |
e7fb9c4a AP |
272 | |
273 | MODULE_AUTHOR("Alberto Panizzo <maramaopercheseimorto@gmail.com>"); | |
274 | MODULE_DESCRIPTION("EPSON L4F00242T03 LCD"); | |
c3cf2e44 | 275 | MODULE_LICENSE("GPL v2"); |